The BGS Lexicon of Named Rock Units — Result Details

Balleich Lava Member

Computer Code: BALH Preferred Map Code: BAL
Status Code: Full
Age range: Lochkovian Age (DO) — Lochkovian Age (DO)
Lithological Description: A fine- to medium-grained, commonly vesicular and amygdaloidal olivine basalt.
Definition of Lower Boundary: A conformable contact with medium-grained sublithic sandstone of the Bofrishlie Burn Sandstone Member.
Definition of Upper Boundary: Not seen, but quartz and quartzite conglomerate of the parent Craig of Monievreckie Conglomerate Formation, in close proximity above.
Thickness: Approximately 30 m thick.
Geographical Limits: The north-west limb of Strathmore Syncline between Maol Ruadh and Balleich in Queen Elizabeth Forest Park.
Parent Unit: Craig Of Monievreckie Conglomerate Formation (CMVC)
Previous Name(s): none recorded or not applicable
Alternative Name(s): none recorded or not applicable
Stratotypes:
Type Section  Small bluff at Balleich, near Aberfoyle. 
Reference Section  Hillock at Dunandry, near Aberfoyle. 
Reference Section  North-west flank of Drum of Clashmore, near Aberfoyle. 
Reference(s):
Browne, M A E, Smith, R A and Aitken, A M. 2001. A lithostratigraphical framework for the Devonian (Old Red Sandstone) rocks of Scotland south of a line from Fort William to Aberdeen. Version 3. British Geological Survey Research Report RR/01/04. 
Phillips, E R and Aitken, A M. 1998. The petrology and composition of the Lower Old Red Sandstone exposed in the Aberfoyle Area (Sheet 38E), Central Scotland. British Geological Survey, Technical Report, WG/98/10. 
1:50K maps on which the lithostratigraphical unit is found, and map code used:
S038